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    <title>webrtc audio 案例</title>
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    <!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Using_DTMF -->

      <p>This example demonstrates the use of DTMF in WebRTC. Note that this
         example is "cheating" by generating both peers in one code stream,
         rather than having each be a truly separate entity.</p>

      <audio id="audio" autoplay controls></audio><br/>
      <button name="dial" id="dial">Dial</button>

      <div class="log"></div>
      <script src="index.js"></script>
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